BuddyPress.org

@somethingelse doing if ( $wp_user->roles[0] == 's2member_level3' ) inside the loop is great but you might find your pagination doesn’t take your condition into account. For that you’ll need to hook into the bp_ajax_querystring filter

See the technique in action on the BuddyDev website:

Exclude Users from Members directory on a BuddyPress based social network